Question

The ratio of radius of two circles is 3:27 what is the ratio of circumference?

Answer 1

Circumference of acircle is 2 pie r
Simply put the value of radius
And the ratio will be 1:9

Answer 2

The answer is given below :

We know that,

the circumference of a circle is

= 2 × π × radius of the circle

The ratio of the two circles is = 3 : 27

Let, the common multiple = a

Then the radius of the circles are 3a units and 27a units respectively.

Then the circumferences of the circles are

(2 × π × 3a) units and (2 × π × 27a) units respectively.

Then the ratio of their circumferences be

= (2 × π × 3a) : (2 × π × 27a)

= 3 : 27

= 1 : 9

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